Shuttering element



Aug. 21, 1951 H. RUTGERS SHUTTERING ELEMENT Filed April 19, 1949 Patented Aug. 21, 1951 ,UNITED STATES, PATENT oFncE SHUTTERING ELEMENT V Hendrik Rutgers, The Hague, Netherlands 2 Claims.

* i The invention relates to temporary supports for the erection of concrete structures.

Usually supports of this type are made entirely of wood and form a complete mould for the concrete to be poured in, This use of wood is very expensive and results in much waste.

When instead of ordinary wood use is made of artificial wood, this drawback of large amounts of waste remains, while artificial wood, too, is an expensive product.

It has also been proposed to make the framework wall proper, i. e. the part coming into direct contact with the concrete, of cheaper material. Examples of such material are impregnated paper or tissue, or thin sheet metal. The two firstmentioned materials are to be considered as definitely lost after use. Sheet metal can be used again, but is*rather expensive.

Such thin framework layers have to be supported by a reinforcing structure, e. g. constituted by a network of bars.

The present invention combines low use of material with the advantages of a closed framework. According to the invention the temporary support comprises a skeleton structure covered by a lining material, said skeleton structure being constituted by a network of bars in which a number of bars is arranged in parallelism and crossed by the remaining bars being parallel and characterized in that the bars are pivotably connected in the points of crossing to be relatively movable in the plane of the network.

It has been found that certain types of paper are very suitable for lining, especially long fibre papers. If only this support is of such a nature that the lining remains intact and flat and smooth, the skeleton framework may be increased as to thickness, as a result of which its rigidity will be considerably increased.

It is the main object of the present invention to provide a mould framework for which the lining material may be made as cheaply as possible of a thin sheet, while the skeleton supporting framework for it is not only inexpensively manufactured, but may also be used repeatedly, and for various purposes without any wastage.

The skeleton wall-structure according to the invention constitutes a plate having the character of a series of interconnected pairs of scissors. It can readily and instantaneously be expanded in its own plane. If it is expanded in one direction, it becomes smaller in the direction perpendicular to it and vice versa. It can, therefore, be applied for all kinds of flat wall surfaces. In particular it is also suitable to be used as 2 supporting framework for concrete floors. If they are made of wood, the total quantity of wood to be used for it is considerably smaller than would be required for a normal framework consisting of boards. Consequently, the framework is also more easily handled. In a preferred embodiment of the present invention it consists of wooden laths or bars. It may, however, also consist partially or entirely of metal.

The mesh of the netting is chosen in relation to the free unsupported length of the lining material upon the skeleton framework which can support the concrete without sagging.

The invention will be more readily understood from the following description with reference to the accompanying drawings in which:

Fig. 1 is a partial plan view of a supporting framework according to the invention; and

Fig. 2 is a cross-sectional view taken on the line 11-11 in Fig. 1.

According to Figs. 1 and 2 the skeleton framework consists of a number of parallel laths I made of metal or wood. They are assembled to form a stiff grating united by means of crosslaths 2. The grating thus'constituted is used as part of a wall or floor in a shuttering. The supporting grating is coated with paper 6 being sufiiciently strong and moisture-proof, or rendered moisture-proof by impregnation. The concrete is cast or poured on the paper 6. After setting the grating may be removed. The paper can also be readily removed in fragments or in entire sheets.

In many cases the paper 6 or other lining material will sag slightly between the laths I, as a result of which the concrete surface will be slightly undulated. If this renders difficulties, the lining material will have to be given an extra support between the laths I.

Above the laths 2, there are metal strips 1 with their top surfaces level with those of the laths I. These strips 1 move together with the laths 2, of which they really form a part. Where they intersect the laths I, the latter have been recessed as at 8 to receive them. In this way it is ensured that in all the elements of the structure, the

upper surfaces are flush one with another and thus form a flat support for the lining material 6. Screws or rivets arranged on the crossing points keep together the strips I and the laths 2, and on the other hand act as pivots for the lath I and 2.

It will be understood that the construction may also be useful for other building purposes, e. g. in assembling parts of window frames, and that various modifications and structural 3 changes may be made without departing in any way from the spirit of the invention.

I claim:

1. Removable shuttering type supporting structure for concrete construction and the like, including an areally adjustable network of crisscrossed elongated members consisting of a series of parallel rigid bars spaced equidistantly apart, a second series of parallel rigid bars similarly spaced apart and angularly crossing the first mentioned rigid bars upon one side thereof, a third series of parallel thin flat strips individually parallel to the rigid bars of the second series and angularly crossing the said first mentioned rigid bars upon the other side of the latter, and a plurality of pivot members pivotally connecting the rigid bars of said second series and the thin flat strips of the third series to the rigid bars of said first mentioned series at the mutual crossing points in such manner as to allow at least limited swiveling movement of said bars and strips upon each other.

2. Removable shuttering type supporting structure for concrete construction and the like, including an areally adjustable network of crisscrossed elongated members consisting of a series of parallel rigid bars spaced equidistantly apart, a second series of parallel rigid bars similarly spaced apart and angularly crossing the first mentioned rigid bars upon one side thereof, a

third series of parallel thin flat strips individually parallel to the rigid bars of the second series and angularly crossing the first mentioned rigid bars upon the other side of the latter, said rigid bars of said first mentioned series having recessed portions corresponding in depth to the thickness of said thin flat strips and being of sufficient with to provide clearance for adjusting movements of said thin flat strips, and a plurality of pivot members pivotally connecting the rigid bars of said second series and the thin fiat strips of the third series to the rigid bars of said first mentioned series at the mutual crossing points in such manner as to allow at least limited swiveling movement of said bars and strips upon each other.

' HENDRIK RUTGERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,251,499 Pelton e- Aug. 5, 1941 v FOREIGN PATENTS Number Country Date 10,218 Great Britain Apr, 277, 1911 10,403 Great Britain Apr. 28, 1911 

